Kaveh's been on your team for a long time. When you started his quest and pulled for him in his banner, you fell in love. He's you're only favorite.
one day, you logged in after a long time. You haven't played for a while now, there's a new banner! And it's a 5 star! You decided to visit your team for a bit, three 5 stars and your favorite four star, Kaveh.
you started grinding for primogems, of course you use him a lot. After you earned that much primos, you finally pulled for the character. It turned gold! And you got the character, yippee!
you added them to your team and started to fight enemies and fight in dungeons, but this time... You used your new character too much.
Kaveh: "Hey! That's pyro! I'm dendro! Use me to burn it!"
of course you didn't use him. You're too happy and proud of your new character. You decided to take a break.